QNAP TR-004U 4 Bay Rackmount NAS Expansion - Flexible USB Type-C

Our review of the QNAP TR-004U finds it best suited for small offices and power users who need a simple way to add reliable shared or direct-attached storage. The biggest reason to buy is its flexibility: the enclosure functions as a 4-bay hardware RAID unit for a QNAP NAS or as a DAS via the USB 3.0 Type-C port, giving fast access and multiple deployment options. In practice the TR-004U is straightforward to set up, offers solid mechanical design with lockable trays, and lets users configure RAID and monitor disk health through a QNAP NAS using Storage & Snapshots Manager.

Key Features

• USB 3.0 Type-C port: Provides faster data transfer and simple direct-attached access when connected to a PC or NAS with USB Type-C.
• Four SATA drive bays: Supports up to four 3.5-in SATA drives so users can scale capacity and performance according to their needs.
• Disk mode dip switch: Allows switching between hardware-controlled and software-controlled RAID configurations for flexible RAID setups.
• Lockable hard drive trays: Prevent accidental drive removal and add a level of physical security in shared environments.
• RAID management with QNAP NAS: Users can configure RAID and monitor disk health using Storage & Snapshots Manager on a connected QNAP NAS for integrated administration.
• Cross-platform file sharing: Works as additional storage for a QNAP NAS and can serve as hardware-based RAID storage accessible across platforms.

Who It's For

The TR-004U is aimed at small business owners, content creators, and home lab enthusiasts who already use or plan to use a QNAP NAS and need an easy way to expand capacity without reconfiguring their entire storage infrastructure. It is especially useful when you want the option of connecting directly to a workstation via USB Type-C for fast file transfers.

Users looking for a fully standalone network-attached storage device with built-in network services should look elsewhere; the TR-004U is an expansion and DAS enclosure rather than a full NAS with its own network interface and bundled OS.

Pros & Cons

Pros

• Flexible use as either a DAS or as expansion for a QNAP NAS, covering multiple workflows.
• Dual management approach with disk mode dip switch and QNAP Storage & Snapshots Manager support for RAID and health monitoring.
• Lockable trays and four 3.5-in SATA bays offer secure, scalable capacity in a compact rackmount chassis.

Cons

• Does not include a native network interface, so standalone NAS features require connection to a QNAP NAS or a host PC.

Specifications

Our Verdict

The QNAP TR-004U is a practical, cost-effective expansion enclosure for users who need flexible storage growth or direct-attached performance. It offers solid build quality, multiple RAID options, and easy integration with QNAP management tools, making it a good value for existing QNAP NAS owners and professionals who require detachable, rackmountable storage.

Frequently Asked Questions

Can the TR-004U be used without a QNAP NAS?
Yes. It can function as a direct-attached storage device over USB 3.0 Type-C when connected to a compatible PC.

How are RAID settings configured?
RAID can be set using the disk mode dip switch for hardware/software control and managed via Storage & Snapshots Manager on a connected QNAP NAS.

What size drives does it support?
The enclosure supports four 3.5-in SATA drives for standard desktop hard drives.